1. Identify and accept emotions: Be aware that your possessiveness towards this ambiguous partner is a normal emotional response, but also understand that it may affect the relationship and development between both parties. Accept this emotion while learning to control it and not let it excessively dominate your behavior.
2. Honest communication: Have an open and honest conversation with this girl, expressing your feelings, including the special feelings you have for her and the possessiveness that comes with it. Ask her about her thoughts and feelings, and find out if she has similar thoughts or wishes to maintain the status quo. Through communication, you can better define the boundaries of your relationship with each other.
3. Respect boundaries: Respect a girl's personal space and choice, and do not force her into the relationship state you expect. Understand that everyone has their own rhythm and way of handling emotions, and give them enough freedom and space. At the same time, one should also set their own boundaries and learn to adjust their expectations and behavior in a timely manner when the other party does not have a clear response or willingness.